<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width:100px;
            height: 100px;
            border: 1px solid #000;
            display: inline-block;
        }

    </style>
</head>
<body>
<div>a</div>
<div>b</div>
<div>c</div>
<div>d</div>
</body>
</html>